ASP.NET Core 10 Authentication Guide — JWT, Passkeys, Cookies & More
ASP.NET Core 10 Security Guide 🔥 2026 ASP.NET Core 10 Authentication Guide — JWT, Passkeys, Cookies & More A complete, production-ready guide covering every authentication method in ASP.NET Core 10 — with real C# code examples you can use today. AS Adnan Shaukat May 17, 2026 · 14 min read · Backend Developer Authentication is the most critical part of any backend application. Get it wrong and your users' data is at risk. Get it right and your app is production-ready from day one. ASP.NET Core 10 brings some of the biggest authentication upgrades in years — built-in Passkey (WebAuthn) support , improved cookie authentication for API endpoints , new Identity metrics , and cleaner JWT setup. In this guide I will walk you through every authentication method with working C# code so you can implement them in your own projects today. Table of Co...